/*
      J.Y.Kazakia October 14,1998
 
      This example illustrates the following:

      1) Arrays in C++.

      2) Arrays passed to a function return their updated values to the main.

      Here a set of four numbers is passed to a function called square_them 
      first individually and then as an array.  The results in both cases are
      then compared.  The function forms the squares of the numbers.
 
                                */
#include <iostream.h>
#include <fstream.h>

 /* function prototypes */

void square_them ( float a, float b, float c, float d, float array[] );

ofstream out( "6ex3rep.txt" , ios:: out);

main ( )

{


float a, b, c, d;
float array[4];
int i;

a = 1.1;
b = 2.2;
c = 3.3;
d = 4.4;

for ( i = 0; i <= 3; i++)
array [ i ] =(1+ i) +( i +1 ) / 10.;

/* this is equivalent to writing: array[0] = 1.1;
                                  array[1] = 2.2;
                                  array[2] = 3.3;
                                  array[3] = 4.4;


   Print before you call the function    */
out << " \n\n\n  Printing before  calling the function";
out << endl << endl;
out << " a =" << a << " b =" << b << " c =" << c <<" d =" << d ;

for ( i = 0; i <= 3; i++)
out <<"\n\n   array["<<i<<"] = "<<array[i];



/****************************************************************************

   Call the function

****************************************************************************/

square_them( a, b, c, d, array );

/*   Print after  you call the function    */

out << " \n\n\n  Printing after  calling the function";
out << endl << endl;
out << " a =" << a << " b =" << b << " c =" << c <<" d =" << d ;

for ( i = 0; i <= 3; i++)
out <<"\n\n   array["<<i<<"] = "<<array[i];


}


/*____________________________________________________________________________*/



void square_them( float a, float b, float c, float d, float u[])

{
int i;

a = a * a;
b = b * b;
c = c * c;
d = d * d;

i=0;
while (i <= 3)
  {
     u[i] = u[i] * u[i];
     i++;
  }

/*   Print from within the function    */

out << " \n\n\n  Printing from within the function";
out << endl << endl;
out << " a =" << a << " b =" << b << " c =" << c <<" d =" << d ;

for ( i = 0; i <= 3; i++)
out <<"\n\n   array["<<i<<"] = "<< u[i];

}


/*________________________________________________________________________

   THE OUTPUT IS:


    


  Printing before  calling the function

 a =1.1 b =2.2 c =3.3 d =4.4

   array[0] = 1.1

   array[1] = 2.2

   array[2] = 3.3

   array[3] = 4.4 


  Printing from within the function

 a =1.21 b =4.84 c =10.89 d =19.36

   array[0] = 1.21

   array[1] = 4.84

   array[2] = 10.89

   array[3] = 19.36 


  Printing after  calling the function

 a =1.1 b =2.2 c =3.3 d =4.4

   array[0] = 1.21

   array[1] = 4.84

   array[2] = 10.89

   array[3] = 19.36


   */